Ireland's Arthur Lanigan-O'Keeffe is set to make his Olympic debut in Modern Pentathlon at London 2012 after Polish competitor Lukaz Klekot tested positive for banned substance Methylhexaneamine.

Arthur, the 20year old Ad Astra Elite Athlete, studying Sports & Exercise Management at UCD achieved the next best results at the 2012 European Championships which earned hime the place on the team.

Klekot's positive test came at the 2012 national championships and he has been withdrawn from Poland's Olympic squad with immediate effect by the national Olympic committee, the sport's governing body UIPM confirmed on their website.

"UIPM fully supports the Polish Olympic Committee in this discussion, as we have a zero policy to doping. This is a strict reminder to all other athletes that they need to exercise extreme caution over what they put into their body," stated UIPM secretary general Jodl Bouzou.

"Modern Pentathlon has a proud tradition in being a clean sport for many years. This incident is disappointing, however it is an isolated incident, as UIPM has done 210 in and out-of-competition tests in 2012 alone, and they have all been negative.

"UIPM is confident that the rest of the 72 athletes that will line up in London will be clean and we can focus on high performance to celebrate the 100 years anniversary of Modern Pentathlon in the Olympic Games."

Lanigan is ranked in the world’s top 50 in the event, which consists of pistol shooting, fencing, 200m freestyle swimming, show-jumping, and a 3km cross country run.

After placing 25^th in World Cup 1 USA, 20th at World Cup 2 in Brazil and 22^nd in Hungary, he eventually finished 24th at the World Cup in China, the Kilkenny athlete narrowly missing out on qualification.

Arthur will join Natalya Coyle on Ireland’s modern pentathlon team.

Below, Lanigan O’Keeffe introduces himself in his own words.

“I come from an equestrian background, both my parents were involved in horses so as a child I did a lot of horse riding and I started taking swimming lessons to address my severe co-ordination problems that I had when I was younger. I soon fell in love with the sport of swimming and became competitive at youth level. I was then recruited to compete for my pony club (Warrington) in the Tetrathlon championships (Running, Shooting, Swimming & Riding). I became very good at Tetrathlon and wanted to take it to the next level so I took up Pentathlon and received a sports Schalorship to an Elite sporting school in England called Millfield were I began to train seriously. And the rest is history!”

Ireland’s modern pentathlon manager Lindsey Weedon said today his late inclusion is "great news for our sport in Ireland."

She added: "Arthur has done exceptionally well and just failed to gain his Olympic berth directly. With the withdrawal of the Polish competitor, Arthur’s Olympic dream has come true"